learning today a government-funded think tank concluded if scientists were to learn of an impending impact, public should not be warned. it says panic, misery and disruption would not be worth while. the institute suggests telling people only if there is something human race can do. >> it's overwhelming power from space. thank you very much. well, these two occurrences has people asking what is theósk difference between a meteor and an asteroid. let's turn to sandhya patel on the roof keeping an eye out for anymore asteroids. >> oi, watch out, i am, indeed. nasa says the asteroid passed by just hours after the meteor yitd hit russia is just a coincidence, asteroids are rocky objects sometimes big enough to be called minor planets. we also have meteorites smaller than asteroids but orbit the sun. these are small businesses of an asteroid. if a meteor enters and vaporizes it becomes a shooting star but if it lands on earth we can call it a meteorite. that exploded today. check out this map. it shows us a site of every known meteor landing since 2300 bc. wow it's a stunning image. u.s. meet